X509SubjectKeyIdentifierClause.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / IdentityModel / System / IdentityModel / Tokens / X509SubjectKeyIdentifierClause.cs / 1305376 / X509SubjectKeyIdentifierClause.cs
                        

                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.IdentityModel.Tokens 
{
    using System.Globalization; 
    using System.Security.Cryptography.X509Certificates; 

    public class X509SubjectKeyIdentifierClause : BinaryKeyIdentifierClause 
    {
        const string SubjectKeyIdentifierOid = "2.5.29.14";
        const int SkiDataOffset = 2;
 
        public X509SubjectKeyIdentifierClause(byte[] ski)
            : this(ski, true) 
        { 
        }
 
        internal X509SubjectKeyIdentifierClause(byte[] ski, bool cloneBuffer)
            : base(null, ski, cloneBuffer)
        {
        } 

        static byte[] GetSkiRawData(X509Certificate2 certificate) 
        { 
            if (certificate == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("certificate"); 

            X509SubjectKeyIdentifierExtension skiExtension =
                certificate.Extensions[SubjectKeyIdentifierOid] as X509SubjectKeyIdentifierExtension;
            if (skiExtension != null) 
            {
                return skiExtension.RawData; 
            } 
            else
            { 
                return null;
            }
        }
 
        public byte[] GetX509SubjectKeyIdentifier()
        { 
            return GetBuffer(); 
        }
 
        public bool Matches(X509Certificate2 certificate)
        {
            if (certificate == null)
                return false; 

            byte[] data = GetSkiRawData(certificate); 
            return data != null && Matches(data, SkiDataOffset); 
        }
 
        public static bool TryCreateFrom(X509Certificate2 certificate, out X509SubjectKeyIdentifierClause keyIdentifierClause)
        {
            byte[] data = GetSkiRawData(certificate);
            keyIdentifierClause = null; 
            if (data != null)
            { 
                byte[] ski = SecurityUtils.CloneBuffer(data, SkiDataOffset, data.Length - SkiDataOffset); 
                keyIdentifierClause = new X509SubjectKeyIdentifierClause(ski, false);
            } 
            return keyIdentifierClause != null;
        }

        public static bool CanCreateFrom(X509Certificate2 certificate) 
        {
            return null != GetSkiRawData(certificate); 
        } 

        public override string ToString() 
        {
            return string.Format(CultureInfo.InvariantCulture, "X509SubjectKeyIdentifierClause(SKI = 0x{0})", ToHexString());
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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